class Container {
    static of(value) {
        return new Container(value)
    }
    constructor(value) {
        this._value = value
    }
    map(fn) {
        return Container.of(fn(this._value))
    }
}
class MayBe {
    static of(x) {
        return new MayBe(x)
    }
    isNothihng() {
        return this._value === null ||
            this._value === undefined
    }
    constructor(x) {
        this._value = x
    }
    map(fn) {
        return this.isNothihng() ? this : MayBe.of(fn(this._value))
    }
}

module.exports = {
    MayBe,
    Container
}